MI5 warns debate on Russian Brexit interference risks helping Kremlin

Summarised from 3 outlets · Updated 13 Oct, 15:20 · Archive

MI5 chief Ken McCallum has warned that debating Russian interference in the 2016 Brexit referendum risks empowering the Kremlin.

Prime Minister Andy Burnham sparked political controversy by stating on The Rest Is Politics podcast that he had been told 'clearly' upon arriving in Downing Street that Russia had interfered in the 2016 Brexit referendum. The remarks prompted accusations from opponents that he was lying, and Downing Street was forced to admit the interference had made no difference to the Leave vote.

MI5 Director General Sir Ken McCallum confirmed that Russia had attempted to influence the referendum through Kremlin-backed media outlets RT and Sputnik, as well as through social media troll accounts. McCallum noted that this was already a matter of public record, including in Select Committee reports published in 2019. However, he cautioned against reviving the debate, warning it risked empowering adversaries to divide Britain.

McCallum emphasised a crucial distinction: there was a significant difference between 'what may have been attempted and what actually resulted'. He argued that any Russian impact would have been marginal at best. The spy chief said: 'It is up to us how far we allow our adversaries to divide us', expressing concern about letting the issue divide the country further.

How it is being reported

• Russia did try to interfere in Brexit referendum, head of MI5 confirmsSpy chief Ken McCallum said Kremlin had attempted to influence 2016 vote through social media and TV reports Russia did try to interfere in the Brexit referendum through social media and television reports, the head of MI5 said today, but he added that did not mean the Kremlin had any impact on the result. Ken McCallum endorsed comments made by Andy Burnham , who raised the issue over the past two days, though he said continuing to debate it had given the Kremlin a needless propaganda victory. Continue reading...Guardian World · 13 Oct, 16:15
• MI5 Chief Slaps Down Burnham For Reviving Question Over Russian Interference In BrexitDirector General of MI5 Ken McCallum speaks at Thames House, the headquarters of the UK's Security Service in London, Tuesday Oct. 13, 2026. The chief of MI5 has urged Andy Burnham to stop talking about Russia’s attempted interference in the Brexit referendum. Ken McCallum spoke out just days after the prime minister raised the issue on the Rest Is Politics podcast. In remarks that led to a fresh political row, the PM said: “I asked the question coming to Downing Street, was there interference in the 2016 referendum from Russia? “And I’ve had the clear answer that yes, there was.” Just a day…HuffPost UK · 13 Oct, 15:05
• MI5 boss warns the debate on Russian interference in the Brexit vote risks empowering Kremlin trollsHead of MI5 Sir Ken McCallum waded into the row today after the Prime Minister said in a podcast he had been told 'clearly' on arriving in No10 that Vladimir Putin had meddled in the 2016 vote.Daily Mail · 13 Oct, 14:44

In this story: Andy Burnham · Ken McCallum · Vladimir Putin · MI5 · Russia · United Kingdom

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